// Copyright 2021 by LunaSec (owned by Refinery Labs, Inc)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package scan

import (
	"github.com/rs/zerolog/log"
	"github.com/lunasec-io/lunasec/lunatrace/cli/pkg/constants"
	"github.com/lunasec-io/lunasec/lunatrace/cli/pkg/types"
	"strings"
)

func LoadHashLookup(
	log4jLibraryHashes []byte,
	versionHashes string,
	onlyScanArchives bool,
) (hashLookup types.VulnerableHashLookup, err error) {
	if versionHashes != "" {
		hashLookup, err = LoadVersionHashesFromFile(versionHashes)
		if err != nil {
			return
		}
		return
	}

	if onlyScanArchives {
		hashLookup = constants.KnownVulnerableArchiveFileHashes
		return
	}

	hashLookup, err = LoadVersionHashesFromBytes(log4jLibraryHashes)
	if err != nil {
		log.Error().
			Err(err).
			Msg("Unable to load hash lookup for log4j library hashes")
		return
	}
	return
}

func FilterVulnerableHashLookup(fullHashLookup types.VulnerableHashLookup, scanLog4j1 bool) types.VulnerableHashLookup {
	filteredHashLookup := types.VulnerableHashLookup{}

	for hash, vulnInfo := range fullHashLookup {
		shouldAddLog4j1Vuln := scanLog4j1 && strings.HasPrefix(vulnInfo.Version, constants.Log4j1x)
		shouldAddLog4j2Vuln := strings.HasPrefix(vulnInfo.Version, constants.Log4j2x)
		if shouldAddLog4j1Vuln || shouldAddLog4j2Vuln {
			filteredHashLookup[hash] = vulnInfo
		}
	}
	return filteredHashLookup
}
